What are bio-degradable lubricants?
Biodegradable or biolubricants are made from vegetable oils (rapeseed oil) or synthetic oils (synthetic esters) that are quickly decomposed by living organisms and are less toxic for people and aquatic environments. Vegetable oils: they consist of olive
What is viscosity and viscosity index
Define: Viscosity: viscosity is the measure of internal resistance to motion of a fluid due to cohesion between its own molecules. Absolute viscosity: absolute viscosity, eta is defined as the force per unit required maintained the unit
Applications of bio-degradable lubricants
The applications of bio-degradable lubricants are as follows- Vegetable oils: They are used for Lubricants sawmill blade. Chain drive lubrication. In low to medium pressure hydraulic systems. Lightly loaded gear drives (operating temperature is more than 600)
Advantages and disadvantages bio-degradable lubricants
The advantages of bio-degradable lubricants are- High viscosity index: it ensures that the lubricants remain effective at high temperature by maintaining the thickness of the oil film. High flashpoint: it considerably reduces the risks of fire due
Distinguish between flash point and fire point
The differences between flash point and fire points are as follows- Flashpoint Fire point Flashpoint of given lubricants is defined as the lowest temperature at which the lubricant under test gives off sufficient vapours to produced a
What is consistency and drop of grease
The consistency of grease is defined as the distance in tenths of millimetres that a standard cone travels through a sample of grease under test at standard condition of load (150g) temperature (250C) and time (5 seconds).
Dc machine
Yoke It is a frame which gives mechanical support and protection to other parts of machines from moisture and dust. it provides a path of low reluctance for the flow of flux. Poles, pole core and pole
What is lubricating emulsion
An emulsion is a two-phase system which consists of two immiscible liquid (such as oil and water), the one being dispersed in other. Out of two liquids, one which is broken into droplet is called as dispersed
Blended oils
The importance of following additives Antioxidants Corrosion inhibitors Extreme pressure additives Petroleum oils are often mixed with chemicals and vegetable or animal oils improve their lubricating property. The chemicals mixed in the lubricating oils are known as
Petroleum lubricating oil
Petroleum lubricating oils are hydrocarbons obtained by re-fractionation of heavy oil fraction of crude petroleum oil. The lubricating oil obtained contains many impurities which are purified by – Dewaxing– oil is mixed with solvents like propane, benzene